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Types of meshing elements

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Mesh elements can be 1D (lines), or 2D (triangles, or quadrilaterals.), but most of the time, when starting with 3D CAD data, the elements will be tetrahedra (tets; 3-sided pyramids), hexahedra (hexes or bricks), polyhedra (with any number of sides), prisms, or pyramids (with 5 sides.)